function n2 = dist2(x, c)%DIST2	Calculates squared distance between two sets of points.%%	Description%	D = DIST2(X, C) takes two matrices of vectors and calculates the%	squared Euclidean distance between them.  Both matrices must be of%	the same column dimension.  If X has M rows and N columns, and C has%	L rows and N columns, then the result has M rows and L columns.  The%	I, Jth entry is the  squared distance from the Ith row of X to the%	Jth row of C.%%	See also%	GMMACTIV, KMEANS, RBFFWD%%	Copyright (c) Christopher M Bishop, Ian T Nabney (1996, 1997)[ndata, dimx] = size(x);[ncentres, dimc] = size(c);if dimx ~= dimc	error('Data dimension does not match dimension of centres')endn2 = (ones(ncentres, 1) * sum((x.^2)', 1))' + ...  		ones(ndata, 1) * sum((c.^2)',1) - ...  		2.*(x*(c'));